When you date someone you also work with. Can turn out to be a very violatile situation when it comes time to break up.
Joe: Did you see that new billing clerk? I am so going to ask her out.
Max: Dude, don't go fishing off the company pier.
Someone who 'jams' up a gaydar. Someone who gays but is straight. Or someone who acts straight but is gay.
Guy one: Ugh, I can't tell if that hottie is gay or straight.
Guy Two: I know, he shops at American Eagle but he listens to Abba
Guy one: What a total jammer!